Inner bezels are reflective, tinned?
The original lens is said to include a YELLOW triangle and the SWIFT
logo.
Possibly, done in fretwork or leaded-glass window style.
If any one has an original lens of this patented Rotax design, please
contact swift@gotrel.comThe design is described in
'Cycle Car', 1930
and the lens replicated - R.Lamp Lens.html